... The spectrum of the brightest star, our Sun, shows several dark gaps perpendicular to the flow of it’s colours (figure 1). These so called spectral absorption lines where discovered in 1802 by the English scientist William Wollaston. ... Some stars as Pollux show a spectrum similar to that of our sun with strong Ca II and Fe II lines, others as Sirius or Vega show strong absorption lines of hydrogen, others, as Mira show very complicated spectra due to molecular absorption lines (see figure 5). ...

... It provides for logging of the requests made to the server using the Common Logfile Format. This module has been replaced by mod_log_config in Apache 1.2 The log file contains a separate line for each request. A line is composed of several tokens separated by spaces: host ident authuser date request status bytes If a token does not have a value then it is represented by a hyphen (-). ... day = 2*digit . ... TransferLog . ... Context: server config, virtual host . ... Module: mod_log_common . ...

... Recherche dans le site : . Ciel Espace, le magazine qui vous guide toujours plus loin . ... des actualit†йs . ... des pages consacr†йes †а la publication de vos photos Mais c'est aussi une vraie communaut†й avec laquelle partager votre passion et nourrir votre curiosit†й. Accueil Un conduit de lave sur la Lune . ... Outre ce qu'ils enseignent sur l'histoire du volcanisme lunaire, les conduits de lave pourraient constituer un refuge pour les futurs astronautes face aux radiations cosmiques. ...